Walkie Talkie mixer Help

[lecycliste]

Hello!

I am trying to get my head around building a small belt-worn (if possible) box that would make it possible for me to mix the audio signals from 4 Walkie Talkie Radios.
I would like to add the following features:

• 4 potentiometers controlling mix level
• 4 potentiometers controlling pan
• 4 buttons shorting the PTT function of each walkie
• 1 button shorting all PTT functions of all walkies
• 1 mic being sent to all walkies

The walkies have 2 different plugs but they both have pinouts similar to this;

I have general soldering / electronics and programming skills and was thinking to use something based of this:

The goal hers is functionality > Audio quality.

Any and all help is very much appreciated

 

[Mark Tillotson]

First thing to establish is whether the speaker outputs are differential (bridge-tied), and/or class D.